练习册

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    you understand this rule, you’ll have no further difficulty. A. while B. Once C. Though D. Unless 【查看更多】

     

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    ______ you understand this rule, you’ll have no further difficulty.

    A. while                    B. Once                    C. Though                D. Unless

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    ________ you understand this rule, you'll have no further difficulty.

    [　　]

    A．As
    B．While
    C．Once
    D．Whether

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    ________ you understand this rule, you’ll have no further difficulty．

    [　　]

    A．Once

    B．Unless

    C．While

    D．Until

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